You can get a regular AR and put a 7.62 barrel/bolt and shoot it with regular mags/ they just dont hold as many rounds. 20 rounders hold 10-11 IIRC. Some have used the franken mags with good sucess. I just bought this lower. It will accecpt regular AK mags, the mag well is milled a little wider than normal for the wider AK mags. The upper is a 7.62 barrel/bolt with a mod to the bolt carrier, and the upper reciever has been miller a little wider for the wider AK mags. Mike said the DPMS Lo Pro is the best upper reciever to mill since the walls are .25" vs the usual 3/32". DPMS is out of barrels. The only one I know of is Model 1, but its not chromed lined. HTH